APA (7th ed.) Citation

Harding, S. E. (2016). Did the Vikings use crystal 'sunstones' to discover America? Conversation Trust (UK) Limited.

Chicago Style (17th ed.) Citation

Harding, Stephen E. Did the Vikings Use Crystal 'Sunstones' to Discover America? Conversation Trust (UK) Limited, 2016.

MLA (9th ed.) Citation

Harding, Stephen E. Did the Vikings Use Crystal 'Sunstones' to Discover America? Conversation Trust (UK) Limited, 2016.

Warning: These citations may not always be 100% accurate.